Hirokazu Takahashi wrote: > Hi, > >>>> I'm now writing remove-lock-page-cgroup patches. it works well. >>>> please wait for a while... >>> I'm looking forward to those patches. >>> >>> By the way, I'm glad if memory-cgroup has a feature which can make a >>> page_cgroup move between cgroups with small overhead. It makes >>> bio-cgroup improve the accuracy of tracking down pages. >> Page movement can be a very expensive operation and is proportional to the size >> of the control group. I think movement should be an optional feature, if we ever >> add it. > > Yes, we should avoid moving pages as far as it is balanced fairly well > between groups. > > But I want to move pages between bio-cgoups in case it started charging > quite a few I/O requests to a wrong bio-cgroup. I think it will be okay > if pages moves between bio-cgroups, but they don't need to move between > memory cgroups. I know the latter is really heavy and the effect seems > to be so limited. I was under the impression that you wanted memory-cgroup to provide the page movement feature. That is not on the TODO list for us now. -- Balbir -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
